eMMC performance testing

[nirmalluhana]

Hi,

Release: Yocto-Morty (4.9.51_GA)

Board: i.MX8MQ EVK

I have tested eMMC performance on iMX8MQ EVK board using dd & hdparm and I observed that read speed is approx 135-140 MB/s and write speed is approx 20 MB/s. While referring eMMC datasheet it mentions that eMMC performance as below image.

So, what is the reason I have got that much low performance?

Best regards,

Nirmal

[Robbi]

Hi @nirmalluhana ,

                          I'm using imx8, can you help with user manual or commands to test eMMC. 

Thanks & Regards 

Robbi

[igorpadykov · Accepted solution]

Hi Nirmal

slow emmc write issues were already reported on web, like

Re: slow eMMC write speed — Linux MMC Development 

In particular below presentation emphasize on write performance issues for this type of media.

https://elinux.org/images/4/41/Linux_on_eMMC-_Optimizing_For_Performance.pdf 

As for i.MX8MQ, it has many modules and complex architecture with bus arbiters,

so it is not possible to provide max. performance characteristics for every module.

You can increase performance for one module, but that may affect others.

General answer is provided on

USB 3.0 Raw Throughput 

Best regards
igor
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[nirmalluhana]

Hi Igor,

Thanks for your quick support. I understood the reason why it was happening.

Best regards,

Nirmal 

[jagsgediya]

Hi @nirmalluhana What was the reason for slow performance?

[chen-wust]

Now I also want to improve the read and write speed of emmc. Do you have any progress